I’ve had a vibrating pickup before too, but I was able to isolate it by dampening it with my finger to stop the vibration. I’ve tried pressing on the humbucker here, but it doesn’t do anything to stop the vibration, so I’m not sure if that’s what it is.
I’ve tried dampening the bridge, the pickups, and the volume/tone knobs by touching or holding them, but nothing seems to stop the metallic rattle noise and I can’t isolate exactly where it is coming from. It really does sound like it’s either coming from the bridge humbucker or the tune-o-matic portion of the two-piece bridge though. Is there anything inside the humbucker itself that could be vibrating besides the retention spring?
I read somewhere in reference to a Gibson two-piece vibration, that the strings could be set incorrectly in the bridge. Something about the ball being sideways, loose, and rattling. Not sure if that could possibly be the case here. I have not restrung it yet.
The guitar is brand new out of the factory box. Since I wrote the original post, there is now a second non-metallic vibration that has appeared on the bass strings (sounds like a whoosh) that I have isolated to the pickup selector switch. Touch the switch, and it stops. Not sure what to do about this either. The switch seems somewhat loose which I think is wobbling to the resonation of the guitar (the switch mechanism itself seems loose, not how its set in the guitar). Perhaps the way the wood in this guitar resonates is rattling and loosening up things that normally don’t rattle or loosen up, at least not this quickly. Surprisingly, no fret buzz at all and playability is excellent. I can still return the guitar, which if I can’t solve these vibrations, I’ll have to.